The end of multi-aspect ratio sensors?

That's interesting. Apart from confirming my unwillingness to trust a single spec number from a web-site (even when reproduced on this site), it does suggest that the EM5 and GH3 use the same sensor. Panasonic abandoning its sensor development in favor of outsourcing would be surprising, but it could help to explain why the GH3 no longer has a multi-aspect ratio sensor.

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Smaller lenses, better in low light, more telephoto reach:
you can have any two at one time.